20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Heavy-quark masses and heavy-meson decay constants from QCD sum rules

21 Jul 2011, 17:00
15m
Oisans (Alpes Congrès - Alpexpo)

Oisans

Alpes Congrès - Alpexpo

Parallel session talk Flavour Physics and Fundamental Symmetries Flavour Physics and Fundamental Symmetries

Speaker

Dr Dmitri Melikhov (HEPHY, Vienna & SINP, Moscow)

Description

We present the sum-rule extraction of the decay constants of the D, Ds, B, and Bs mesons from the two-point correlator of heavy-light pseudoscalar currents. We use the OPE of this correlator in terms of the running heavy-quark mass, for which the perturbative expansion exhibits a reasonable convergence. Our main emphasis is laid on the control over the uncertainties in the decay constants, related both to the input QCD parameters and to the limited accuracy of the method of sum-rules. The latter becomes possible due to the application of our procedure of extracting hadron observables that involves as novel feature dual thresholds depending on the Borel parameter. Our results for the decay constants contain the full analysis of both the statistical and systematic uncertainties.

Primary authors

Dr Dmitri Melikhov (HEPHY, Vienna & SINP, Moscow) Dr Silvano Simula (INFN, Roma) Dr Wolfgang Lucha (HEPHY, Vienna)

Presentation Materials